demuxer ffmpeg: move m_streams into a map, drop MAX_STREAMS
dvdplayer: move extradata cleanup to CDVDDemuxStream destructor
dvdplayer: keep temporary stream pointer in ffmpeg AddStream
dvdplayer: keep ffmpeg demuxer indexes in continous order
demuxer ffmpeg: handle pmt changes
[ffmpeg] fix shared library versions

Conflicts:
	tools/buildsteps/win32/make-mingwlibs.sh